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Add first comprehensive interconversion test case.
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jzmaddock
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test/test_convert_from_cpp_int.cpp
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220
test/test_convert_from_cpp_int.cpp
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///////////////////////////////////////////////////////////////
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// Copyright 2012 John Maddock. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_
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#ifdef _MSC_VER
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# define _SCL_SECURE_NO_WARNINGS
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#endif
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#include <boost/multiprecision/cpp_int.hpp>
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#include <boost/random/mersenne_twister.hpp>
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#include "test.hpp"
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#if defined(HAS_GMP)
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#include <boost/multiprecision/gmp.hpp>
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#endif
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#if defined(HAS_MPFR)
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#include <boost/multiprecision/mpfr.hpp>
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#endif
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#if defined(HAS_MPFI)
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#include <boost/multiprecision/mpfi.hpp>
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#endif
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#ifdef HAS_TOMMATH
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#include <boost/multiprecision/tommath.hpp>
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#endif
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#ifdef HAS_FLOAT128
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#include <boost/multiprecision/float128.hpp>
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#endif
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#include <boost/multiprecision/cpp_bin_float.hpp>
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#include <boost/multiprecision/cpp_dec_float.hpp>
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using namespace boost::multiprecision;
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template <class T>
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T generate_random(unsigned bits_wanted)
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{
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static boost::random::mt19937 gen;
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typedef boost::random::mt19937::result_type random_type;
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T max_val;
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unsigned digits;
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if(std::numeric_limits<T>::is_bounded && (bits_wanted == (unsigned)std::numeric_limits<T>::digits))
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{
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max_val = (std::numeric_limits<T>::max)();
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digits = std::numeric_limits<T>::digits;
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}
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else
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{
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max_val = T(1) << bits_wanted;
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digits = bits_wanted;
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}
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unsigned bits_per_r_val = std::numeric_limits<random_type>::digits - 1;
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while((random_type(1) << bits_per_r_val) > (gen.max)()) --bits_per_r_val;
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unsigned terms_needed = digits / bits_per_r_val + 1;
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T val = 0;
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for(unsigned i = 0; i < terms_needed; ++i)
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{
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val *= (gen.max)();
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val += gen();
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}
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val %= max_val;
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return val;
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}
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template <class From, class To>
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void test_convert_neg_int(From from, const boost::mpl::true_&)
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{
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from = -from;
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To t3(from);
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To t4 = from.template convert_to<To>();
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BOOST_CHECK_EQUAL(from.str(), t3.str());
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BOOST_CHECK_EQUAL(from.str(), t4.str());
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}
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template <class From, class To>
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void test_convert_neg_int(From const&, const boost::mpl::false_&)
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{
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}
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template <class From, class To>
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void test_convert_imp(boost::mpl::int_<number_kind_integer> const&, boost::mpl::int_<number_kind_integer> const&)
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{
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int bits_wanted = (std::min)((std::min)(std::numeric_limits<From>::digits, std::numeric_limits<To>::digits), 2000);
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for(unsigned i = 0; i < 100; ++i)
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{
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From from = generate_random<From>(bits_wanted);
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To t1(from);
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To t2 = from.template convert_to<To>();
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BOOST_CHECK_EQUAL(from.str(), t1.str());
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BOOST_CHECK_EQUAL(from.str(), t2.str());
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test_convert_neg_int<From, To>(from, boost::mpl::bool_<std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed>());
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}
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}
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template <class From, class To>
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void test_convert_neg_rat(From from, const boost::mpl::true_&)
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{
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from = -from;
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To t3(from);
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To t4 = from.template convert_to<To>();
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BOOST_CHECK_EQUAL(from.str(), numerator(t3).str());
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BOOST_CHECK_EQUAL(from.str(), numerator(t4).str());
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}
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template <class From, class To>
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void test_convert_neg_rat(From const&, const boost::mpl::false_&)
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{
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}
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template <class From, class To>
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void test_convert_imp(boost::mpl::int_<number_kind_integer> const&, boost::mpl::int_<number_kind_rational> const&)
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{
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int bits_wanted = (std::min)((std::min)(std::numeric_limits<From>::digits, std::numeric_limits<To>::digits), 2000);
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for(unsigned i = 0; i < 100; ++i)
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{
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From from = generate_random<From>(bits_wanted);
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To t1(from);
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To t2 = from.template convert_to<To>();
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BOOST_CHECK_EQUAL(from.str(), numerator(t1).str());
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BOOST_CHECK_EQUAL(from.str(), numerator(t2).str());
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test_convert_neg_rat<From, To>(from, boost::mpl::bool_<std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed>());
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}
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}
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template <class From, class To>
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void test_convert_neg_float(From from, const boost::mpl::true_&)
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{
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from = -from;
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To t3(from);
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To t4 = from.template convert_to<To>();
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To check(from.str() + ".0");
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BOOST_CHECK_EQUAL(t3, check);
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BOOST_CHECK_EQUAL(t4, check);
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}
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template <class From, class To>
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void test_convert_neg_float(From const&, const boost::mpl::false_&)
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{
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}
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template <class From, class To>
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void test_convert_imp(boost::mpl::int_<number_kind_integer> const&, boost::mpl::int_<number_kind_floating_point> const&)
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{
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int bits_wanted = (std::min)((std::min)(std::numeric_limits<From>::digits, std::numeric_limits<To>::digits), 2000);
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for(unsigned i = 0; i < 100; ++i)
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{
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From from = generate_random<From>(bits_wanted);
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To t1(from);
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To t2 = from.template convert_to<To>();
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To check(from.str() + ".0");
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BOOST_CHECK_EQUAL(t1, check);
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BOOST_CHECK_EQUAL(t2, check);
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test_convert_neg_float<From, To>(from, boost::mpl::bool_<std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed>());
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}
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}
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template <class From, class To>
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void test_convert()
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{
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test_convert_imp<From, To>(number_category<From>::type(), number_category<To>::type());
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}
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int main()
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{
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test_convert<cpp_int, int128_t>();
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test_convert<int128_t, cpp_int>();
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test_convert<cpp_int, cpp_rational>();
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test_convert<int128_t, cpp_rational>();
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test_convert<uint128_t, cpp_rational>();
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test_convert<cpp_int, cpp_bin_float_50>();
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test_convert<int128_t, cpp_bin_float_50>();
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test_convert<uint128_t, cpp_bin_float_50>();
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test_convert<cpp_int, cpp_dec_float_50>();
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test_convert<int128_t, cpp_dec_float_50>();
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test_convert<uint128_t, cpp_dec_float_50>();
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#if defined(HAS_GMP)
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test_convert<cpp_int, mpz_int>();
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test_convert<int128_t, mpz_int>();
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test_convert<uint128_t, mpz_int>();
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test_convert<cpp_int, mpq_rational>();
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test_convert<int128_t, mpq_rational>();
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test_convert<uint128_t, mpq_rational>();
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test_convert<cpp_int, mpf_float_50>();
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test_convert<int128_t, mpf_float_50>();
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test_convert<uint128_t, mpf_float_50>();
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#endif
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#if defined(HAS_MPFR)
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test_convert<cpp_int, mpfr_float_50>();
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test_convert<int128_t, mpfr_float_50>();
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test_convert<uint128_t, mpfr_float_50>();
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#endif
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#if defined(HAS_MPFI)
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test_convert<cpp_int, mpfi_float_50>();
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test_convert<int128_t, mpfi_float_50>();
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test_convert<uint128_t, mpfi_float_50>();
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#endif
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#ifdef HAS_TOMMATH
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test_convert<cpp_int, tom_int>();
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test_convert<int128_t, tom_int>();
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test_convert<uint128_t, tom_int>();
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test_convert<cpp_int, tom_rational>();
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test_convert<int128_t, tom_rational>();
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test_convert<uint128_t, tom_rational>();
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#endif
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return boost::report_errors();
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}
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